Therefore...
Therefore, the principle of at-Tawhid, as an ideological principle, can have no meaning except the unification of Allah as the only diety. Wherever the word at-Tawhid occurs in Nahjul-Balaghah and in other Islamic traditions, it has the said meaning. Consequently, interpreting this Islamic principle, at-Tawhid, differently, would be nothing but deviation, ignorance, or prejudice.
Other matters, true or untrue, have nothing to do with this principle, that is, supposing that a classless society is supported by Islam, it has no connection with at-Tawhid as an ideological principle of Islam. Even if it could be proved that Islam's opinion was to have a society without classes, still it would be related to at-Tawhid. Stages and Limits of at-Tawhid Believing in Allah's Oneness has many stages: At-Tawhid in the Necessary Being, i.e.
no being has come to existence by itself except Allah. In the terms of philosophy, it is the belief in a being whose existence is necessary. It is only Allah, the Exalted, whose existence is untrinsically a must, and from Whom the other beings take their existence. At-Tawhid in creation. That is, there is no creator except Allah. This is a logical result of the previous point. At-Tawhid in the genetic Lordship. The third stage of at-Tawhid is the genetic management and Lordship.
That is, having admitted that Allah is the Creator of the world, we have to know who its manager and director is, and whether there is anyone, other than Allah, who manages the world without having to obtain His permission.
Should there be an allegation that Allah had created the world, and then its management was handed over to some others, or Allah had nothing more to do with its management, or, if He had, He had it together with some partners, it would be multitheism in Lordship or in Management. In this stage, a monotheist is that who believes that, as the creation of the world needed none other than Allah, similarly, the genetic management, directing and Lordship are exclusively Allah's.
At-Tawhid in the genetic Legislative Lordship. Having known that our Creator is Allah, and that our existence and management are exclusively in His hands, we have to believe also that .none other than Him has the right to issue orders to us and to give law for us. Every law must be endorsed by the Divine order of permission before being regarded as authorized.